It may happen that Your OS will not boot, the boot loader is corrupted. What to do in this case? Fortunately there are some specialized tools that will help You to load the operating system and then fully restore the bootloader. One example is the Super GRUB2 Disk. That's about it and will be discussed further...
Earlier I wrote about how to restore Grub boot loader in articles "Repair GRUB: error: unknown filesystem. grub rescue> in Linux Mint" and "restore GRUB boot loader in Linux Mint after installation/reinstallation Windows".
Super GRUB2 Disk helps you to boot into most any Operating System (OS) even if you cannot boot into it by normal means.
The primary purpose of Super GRUB2 Disk is to help you to load OS, loader which was damaged or destroyed. Next, but not much less important purpose is to help you learn more about the GRUB2 boot loader (GRUB1, GRUB) and the process of loading the operating systems.
The differences between Super GRUB Disk and Super GRUB2 Disk
Let's start with the fact that GRUB2 is a completely rewritten version of the reference implementation of the GRUB bootloader Multiboot specification. In other words GRUB2 in fact the new version. Respectively Super GRUB2 Disk is new version from previous Super GRUB Disk.
The main difference between Super GRUB Disk based on the reference boot loader GRUB, and Super GRUB2 Disk is that the latter does not produce writing to the disk and therefore can't rewrite the MBR.
Super GRUB2 Disk can only be used for loading the operating system is damaged, but can not directly fix the damaged system. But once the system starts up, it is worth nothing how to reinstall the boot loader command
sudo grub-install /dev/sda
or use the utility boot-repair
And as part of the functionality of the Super GRUB Disk, which is based on the classic GRUB, will never be included in Super GRUB2 Disk, and the reverse can also be true. For example, Super GRUB2 Disk supports booting OSX, boot from ISO file, boot an OS from USB without USB support BIOS-om and other functions that are not available in classic GRUB.
Creating a boot disk Super GRUB2 Disk
To create a bootable Super GRUB2 Disk CD enough to burn the image on CD or DVD as well as any other bootable ISO. In addition, image can be used as a bootable floppy image (floppy).
To make a bootable usb stick you can use YUMI (see point 5)
To visually get acquainted with the program, watch the video guide from the developer utilities.